Add version extract for corepack verbose and test cases

npm_and_yarn/lib/dependabot/npm_and_yarn/version.rb

@@ -80,6 +80,10 @@ def clean_version(version)
           # Matches @ followed by x.y.z (digits separated by dots)
           if (match = version.match(/@(\d+\.\d+\.\d+)/))
             version = match[1] # Just "4.5.3"
+
+          # Extract version in case the output contains Corepack verbose data
+          elsif version.include?("Corepack")
+            version = T.must(version.match(/[\r\n](\d+\.\d+\.\d+)))
           end
           version = version&.gsub(/^v/, "")
         end

npm_and_yarn/spec/dependabot/npm_and_yarn/version_spec.rb

@@ -317,5 +317,13 @@
 
       it { is_expected.to be(true) }
     end
+
+    context "with corepack returning a additional info with version string" do
+      let(:requirement) { Gem::Requirement.new("4.6.0") }
+      let(:version_string) { "Corepack is about to download " \
+      "https://repo.yarnpkg.com/4.6.0/packages/yarnpkg-cli/bin/yarn.js 4.6.0" }
+
+      it { is_expected.to be(true) }
+    end
   end
 end